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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
<HTML
><HEAD
><TITLE
>Extensions-1.8. The Prompt</TITLE
><META
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>Implementation Notes for <A
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> <A
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><H1
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><A
NAME="prompt"
></A
>29.8. Extensions-1.8. The Prompt</H1
><P
ALIGN="justify"
>The variable <STRONG
CLASS="FIRST"
><I
CLASS="firstterm"
><A
HREF="prompt.html"
><TT
CLASS="varname"
>CUSTOM:*PROMPT*</TT
></A
></I
></STRONG
> controls
the appearance of the prompt. When its value is a function, it is
called and its value is printed with <A
HREF="http://www.lisp.org/HyperSpec/Body/fun_writecm_p_rintcm_princ.html"
TARGET="_top"
><TT
CLASS="function"
>PRINC</TT
></A
>. Otherwise, the value
itself is printed with <A
HREF="http://www.lisp.org/HyperSpec/Body/fun_writecm_p_rintcm_princ.html"
TARGET="_top"
><TT
CLASS="function"
>PRINC</TT
></A
>. The default value of <A
HREF="prompt.html"
><TT
CLASS="varname"
>CUSTOM:*PROMPT*</TT
></A
> prints
<TT
CLASS="prompt"
>"package[n]&#62;�"</TT
> where <TT
CLASS="replaceable"
><I
>package</I
></TT
> is the shortest
(nick)name of the current package <A
HREF="http://www.lisp.org/HyperSpec/Body/var_stpackagest.html"
TARGET="_top"
><TT
CLASS="varname"
>*PACKAGE*</TT
></A
> if it is <I
CLASS="emphasis"
>not</I
> the
same as it was in the beginning or if it does not contain symbol <A
HREF="http://www.lisp.org/HyperSpec/Body/convar_t.html"
TARGET="_top"
><TT
CLASS="constant"
>T</TT
></A
>
(it is assumed that in the latter case you would want to keep in mind
that your current package is something weird);
and <TT
CLASS="replaceable"
><I
>n</I
></TT
> is the ordinal number of the current prompt
(hopefully, it will remain finite).
To help you in constructing your own fancy prompts, two
functions and one variable are provided:
<P
></P
><DIV
CLASS="variablelist"
><DL
><DT
>function
<TT
CLASS="function"
>EXT:PROMPT-NEW-PACKAGE</TT
></DT
><DD
><P
ALIGN="justify"
>returns <A
HREF="http://www.lisp.org/HyperSpec/Body/var_stpackagest.html"
TARGET="_top"
><TT
CLASS="varname"
>*PACKAGE*</TT
></A
> or <A
HREF="http://www.lisp.org/HyperSpec/Body/convar_nil.html"
TARGET="_top"
><TT
CLASS="constant"
>NIL</TT
></A
> if the current
package is the same as it was initially
</P
></DD
><DT
>function
<TT
CLASS="function"
>EXT:PACKAGE-SHORT-NAME</TT
></DT
><DD
><P
ALIGN="justify"
>takes one argument, a package, and returns its
shortest name or nickname</P
></DD
><DT
>variable <TT
CLASS="varname"
>EXT:*COMMAND-INDEX*</TT
></DT
><DD
><P
ALIGN="justify"
>contains the current prompt number;
it is your responsibility to increment it
(this variable is bound to 0 before saving the <A
HREF="p-indep.html#image"
>memory image</A
>).
</P
></DD
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